Ball pin



FIG. 1 is a perspective view showing my new design for a ball pin;

FIG. 2 is a front elevation view thereof;

FIG. 3 is a rear elevation view thereof;

FIG. 4 is a left side elevation view thereof;

FIG. 5 is a right side elevation view thereof;

FIG. 6 is a top plan view thereof;

FIG. 7 is a bottom plan view thereof; and,

FIG. 8 is a perspective view showing the ball pin in upside down position.

The portions of the screw thread shown in the ball pin in broken lines form no part of the claimed design. 

CLAIM The ornamental design for a ball pin, as shown and described. 